NUUK, Greenland — The United States, Russia and other nations were to sign an agreement Thursday to coordinate Arctic search-and-rescue missions, and begin planning how to prevent a catastrophic oil spill. U.S. Secretary of State Hillary Clinton said the meeting of the eight-nation Arctic Council, which also includes Russia, Canada, Norway, Sweden, Finland, Denmark and Iceland, will highlight the growing importance of the area where melting icecaps are opening […]